Tyrael has a nice guide on how to use a proxy, maybe that can help you get going.
https://osbot.org/forum/topic/68682-how-to-proxy-the-right-way-on-osbot-mirror-client/?tab=comments#comment-757714
Depends on the prayer of the acc and wether you are the original owner and if there is a email set on the acc.
Personally I wouldn't pay more than $20 for this unless it has mith gloves/DT and nice other stats.